Rotary grizzly



A. J. MYERS ROTARY GRIZZLY Dec. 20, 1932.

Original Filed July 3, 1925 2 Sheets-Sheet 1 llmllllvlll A. J. MYERS ROTARY GRIZZLY Dec. 20, 1932.

Original Filed July 5, 1925 2 Sheets-Sheet 2 Patented Dec, 20, 1932 UNITED "STATES PATENT OFFICE ALBERT .I. MYEBS,- ordqmsmmen, PENNSYLVANIA, ssIoNon To Tnnxorrrzas .cOmrANY, or PITTSBURGH, PENNSYLVANIA, A CORPORATION or rENNsYLvANIA- ROTARY oaIzzLY Original application filed. July 3, 1925, Serial No. 41,420. Divided and this application filed November 18, 1930.

This invention com rehends improvements of general utility in e art of screening coke and in its more particular aspects relates to a special arrangement of the driving mechanism with respect to the operating shafts of the so-called grizzly so as to permitready removal of any shaft of the grizzly for rep airs without disturbing the driving mechanism or the removal of parts of the driving mechanism without disturbing the grizzly while maintaining at all times an efficient lubrication of the driving mechanism and protecting it from the coke dust.

, The present invention relates particularly to the provisions for the features of maintaining at all times an eflicient lubrication of the driving mechanism and protecting it from the coke dustdescribed in my co-pending application for rotary grizzly, Ser. No.

' 41,420, filed July 3, 1925, now Patent No.

1,7 85,841, issued December 23, 1930, of which this application is a division.

In the preparation of coke for the market it is essential to screen out the finer particles =1 therefrom and this can be most efficiently and quickly achieved by the use of the co-c'alled grizzly comprising an inclined frame-work carrying a plurality of parallel shafts on which are non-rotatably mounted hard cast iron discs, the peripheries of the discs of one shaft inter-meshing with those on the next adjacent shafts leaving restricted spaces at the ends of the peripheries for the sifting out of the finer particles of coke. The motion of the coke is substantially forward and downward, there being an undulating or cascade movement imparted thereto by the peripheries of the discs and the stream of coke is ordinarily attenuated towards the lower end by increasing the speeds of the successive shafts from top to bottom. Such construction has higher capacity than any other known type of screen and is'in fact the most practical way in which large sizes of coke may be efliciently screened. However, the larger particles of the material to be screened out frequently catch and stick in the open spaces between the inter-meshing discs and due to their very hard characterrelatively much harder than is possible to make the cast iron discs Serial No. 496,389. I

per discs become sufliciently worn to materially affect the standard of the-screening correction is in general made either by shifting the shafts and their attached discs from the lower portion of the screen to the upper and from the upper to the lower, or by replacement of the worn discs by new ones, or. replacements maybe made after the first shift whenever it becomes desirable, all of which operations necessitate the removal of the shafts. As heretofore practiced, it has been customary to permanently mount the driving mechanism for the shafts on the ends of the latter outside of their bearings, but this necessitated, when the shafts were shifted or replacements made, the removal of the portion of the driving mechanism attached to the shaft or shafts removed from the rest, even though the driving connections between the several shafts were in good order and well lubricated. The disturbance of these connections made it necessary tore-lubricate the driving mechanism when iagain set up and rendered it liable to the introduction of destructive coke the ends of said shafts. The driving mecha-- nism may conveniently consist of a plurality of countenshafts connected to each other within said casing by appropriate gears, or

chains and sprockets, or other connecting mechanism, the counter-shafts being connected to the main shafts with which they'are respectively in alignment by appropriate coupling members which permit ready'uncoupling of the main shaft from the countershaft when it is desired to remove the former for replacement or repairs. A further feature of my invention consists in providing an oil tight casing for the driving mechanism separate from the main frame of the grizzly and preferably provided on its bottom with a plurality of baffles or dams forming pockets for the retention of oil into which the driving connections between the several countershafts may dip and thuseifect the necessary lubrication of the driving mechanism. If desired, similar baffles maybe placed in said casing above the driving mechanism in the path of oil thrown off by centrifugal force to facilitate equalization in distribution of oil throughout the casing. When the counter-shafts are connected by gears and idlers, the direction of rotation of the idlers is such as to pump oil out of thepockets, over the dams, and to the bottom. of the casing. I therefore preferably provide the casing with means forpumping the oil from the lower end thereof to the upper cndto maintain its circulation throughout the casing. The top of the casing may be provided with removable covers or doors to permit inspection.

In addition to the'general features and objects of the invention above recited, the invention has such other improvements or advantages in construction and operation as are found to obtain in the structure and devices hereinafter described or claimed.

In the accompanying drawings, forming a part of this specification, and showing for purposes of exemplification a preferred form and manner in which the invention may be embodied or practiced, but without limiting the claimed invention specifically to such illustrative instance or instances:

Figure 1 is a top plan view of a grizzly embodying the features of my invention, taken from the line 11 of Fig. 2, with a portion of the driving casing removed and showing the grizzly discs partly broken away,

Fig. 2 is an end View partly in section, on the line 22, Fig. 1, showing the casing for the driving mechanism and its supports,

F ig- 3 is a detail perspective view of the preferred form of coupling employed by me, showing the parts separated,

Fig. 4 is a similar view showing the parts assembled,

Fig. 5 is a plan view of a modified form of my invention with the top of the driving casing removed, showing a chain and sprocket drive therein,

Fig. 6 is a vertical section through the casing on the line 6-6 of Fig. 5, and

Fig. 7 is a transverse vertical section on the line 77 of Fig. 6, showing a countershaft and its two sprockets.

The same characters of reference indicate the same parts in each of the several views of the drawings. 1

Referring to Fig. 1 there is shown a grizzly 1 provided with supporting frames 2 adapted to support the sameat an inclina= ticn shown in Fig. 2. Within these frames are journaled a plurality of parallel driven shafts 3 on which are non-rotatably mounted a series of discs 4-, the peripheries of the discs of each shaft being interleaved with those of the adjacent shafts, free spaces existing at the ends of the discs ofappropriate size for the passage of the finer particles of coke which it is desired to separate from the main body thereof. These shafts 3 are journaled at their opposite ends inbearings having their upper parts 5 removable to permit removal of the shafts together with the disc thereon for repair or replacement; Located just in-' side of the hearings on each side are coke guide-plates 6 for confining the coke laterally. The shafts, as has heretofore been the custom, are driven from a common source of power through inter connected gears-between the several shafts, or by chains and sprockets. In accordance with prior practice, the driving gears or sprockets were permanently directly connected to theends of the shafts, necessitating, as hereinbefore noted, the dismembering of the driving mechanism when it was desired to change or repair a set of discs. I, however, construct each shaftand its discs as a unit removable lndependently of the driving mechanism'without the necessity of disturbing the latter. To accomplish this result I connect each shaft through a separable coupling 7 with a corresponding counter-shaft 8 and mount all of said countershafts in a separate casing distinct and apart from the bearing supports for the corresponding main shafts, one of the countershafts 9 beingconnected to the source of power and all of the counter-shafts being supported in separable bearings 10 in the casing 11. lhese counter-shafts may be interconnected respectively by sets of driving gears 13 and driven gears 13' inter-connected by idlers 14.

The separable coupling 7 in order to satisfy the special conditions met with in constructions of the character, preferably consists of three parts-15, 16 and 17. The part 15 is connected by its collar 18 to the end of a main shaft and its body portion 19 is provided diametrically across its face with a channel 20 and in contact with the body 19 is adapted to rest afloating intermediate part 21 provided with a tongue 22 diametrically across its face adapted to seat in the channel 20 and on the opposite face of the member 21 is provided diametrically a second tongue 23 preferably at right angles to the first adapted to seat in the corresponding channel 26 in the face oft-he body member 25 of the third, coupling member 17 the latter being provided with a collar 24 by which it is nonrotatably secured to a counter-shaft by the key-way 27. If desired, the floating member 21 may be made integral, say, with the body member 25, one removable tongue and channel connection alone being sufficient to permit quick removal of a shaft. Either arrangement here indicated, while per se old, has a special utility in my construction since it obviates the necessity of removing bolts or nuts, thus facilitating the quick and convenient removal of a shaft. Moreover, the floating member, when employed, additionally effects an efficient drive even though the shaft and its counter-shaft be not in exact alignment.

The casing of the driving mechanism, as a further feature of my invention, is preferably made oil and dust tight and is di-' vided into a lower part" 30 and an upper removable part 31 connected by bolts 33 and provided with oil tight hinged covers 3l'to permit inspection. The bottom of the lower casing section is provided, intermediate the idler gears 14, with upstanding bafiles or dams 35 adapted with the bottom to form pockets into which the oil may settle and into which the idlers dip. Further baffles 36 are provided in the upper casing section intermediate the driving and driven gears 13 and 13, and since the idlers 14, as shown in Fig. 2, normally rotate in a countereclockwise direction and thereby tend to pump oil out of the pockets, causing it to descend to the bottom of the casing, I preferably employ an oil return pipe 37 connected to the bottom of the casing through which the oil is pumped by a pump 38 and a pipe 39, into the upper end of the casing thereby maintaining continuous the low of oil therehrough.

In Figs. 5, 6 and 7, is shown a modified form of drive, consisting of driving sproclc ets 50 and driven sprockets 51 on the counter shafts connected respectively in pairs by chains 52, the consecutive chain drives being connected in ofiset staggered or overlapping relation as shown in Fig. 6. I provide an oil pocket for each chain drive in correspondin overlapping relationship by extending from the bottom of the casing walls or dams 58, and since in a chain drive, the chain passes through the oil in a reverse direction to the motion of the idlers in Fig. 2 0r clockwise they tend to carry the oil up the incl ne and maintain the several pockets filled therewith, thus obviating the necessity of using an oil pump and return pipes from the bottom to the top of the oil casing althoughthe latter may, of course, be employed if desired.-

which the driving mechanism-proper and its lubricating medium". are atjall times protected against grit and dust by reason of its closed casing, and this condition also prevails regardless of the extent to which it may become. necessary to repair or replace parts of the grizzly unit proper. Moreover, the rotation of the idlers 1401' the chains 52 in their'respective oil pocketseffeets a continuous feed oftheoil to the driving mechanism maintaining a uniform lubrication of the latter. The uniformity of lubrication in the case of the idlers may be further enhanced by the use of the oil pump 38and the return oil flow pipes 37 and 39 leading from thebottom of the case to the top thereof, and by the further use of baflles 36 between the gearing on the counter-shafts. Should it be necessary to repair the driving mechanismthis also may readilybe accomplished without disturbing the grizzly mechanism. I

The invention as hereinabove set forth is embodied in a particular form of construe-- tion but may be variously embodied within the scope of the claims hereinaftermade.

I claim:

1. Ina rotary grizzly the combination: of opposite side frames, a plurality of shafts journaled in said side frame and disposed in inclined series, one shaft higher than the other, rotary screening rollers on said shafts, an inclined housing adjacent one of said side frames and in which the driven end of said shafts are journal'ed, said housing constituting an oil retaining reservoir provided with upstanding baffles dividing said reservoir into a plurality of oil holding compartments in an inclined series that communicate with each over over the intervening baffles whereby oil descends by centrifugal flowage induced by toothed wheels therein over the baffies from each compartment to the next compartment, driving mechanism for said shafts including toothed wheels, certain of said wheels being arranged insaid oil holding compartments respectively for lubricating the gearing elements of said shafts and for effecting the aforesaid centrifugal fiowage overthe intervening bafiles, and means for driving said gearing elements. I.

2. Ina rotary grizzlythe combination of opposite side frames, a plurality of shafts journaled in said side frames and disposed fecting the aforesaid centrifugal flowage in inclined series, one shaft higher than the over the intervening baffles.

other. screenin rollers on said shafts an inclined housing adjacent one of said side in frames and in which the driven end of said shafts are journaled, said housing constituting an oil retaining reservoir provided with upstanding baffles dividing said reservoir into a plurality of oil holding compartments in an inclined series that communicate with each other over the intervening baffles whereby the oil descends by filowage induced by toothed wheels therein over the baffles from each higher compartment to each lower compartment, gearing elements connected with said shafts and including toothed wheels, certain of said wheels being arranged in said oil holding compartments respectively for lubricating the gearing elements of said shafts and for effecting the aforesaid centrifugal flowage over the intervening bafiies, means for driving said gearing elements, a pipe line returning the oil from the lowest to the highest of said compartments, and a pump in said'line. V

3. In a rotary grizzly the combination with an inclined series of roller shafts arranged one shaft higher than the'other, of an inclined housing for said shafts, upstanding bafiies dividing said housing into a plurality of oil holding compartments in an inclined series that communicate with each other over the intervening baffles whereby the oil progresses by centrifugal fiowage induced by gearing elements therein over the baffles from each compartment to the next compartment, driving mechanism for said shafts comprising rotatable gearing elements including gears, certain of said gearing elements being arranged in said oil holding compartments respectively for lubricating the gearing elements and for effecting the aforesaid centrifugal flowage over the intervening bafiies,

r oil circulating connections between different portions of the interior of said housing for effecting recirculation of oil from one to anr other of said portions. and means for driv- EDT ing said gearing elements.

4. In a rotarv grizzly the combination with an inclined series of roller shafts arranged one shaft higher than the other, of an inclined housing for said shafts, upstanding baffles dividing said housing into a plurality of oil holding compartments in an inc-lined series that communicate with each other over the intervening baffles whereby the oil de scends by flowage induced by gearing elements therein over the baflies from each higl er compartment to each lower compartment, rotatable gearing elements connected with said shafts and including gears, certain of said gearing elements being arranged in said oil holding compartments respectively for lubricating the gearing elements and for ef- In testimon y hand.

y whereof I have hereunto set 

